Kiwi mum sings for lost son in 'The Missing People Choir'

A Kiwi woman has taken part in a Britain's Got Talent audition, as part of an emotional choir performance centred around missing persons.

The Missing People Choir is made up of a number of people who have loved ones that have been lost, including a New Zealand woman whose son Quentin Godwin disappeared when he was 18 years old.

"He just walked away from the family home one afternoon after school and was just never seen again," Sarah Godwin told the show.

Quentin Godwin went missing in Titirangi, west Auckland, in May 1992, and despite a search, poster campaign, and media appearances including Crimewatch and a missing people documentary, no trace of him has been found.

The Missing People Choir auditioned with its emotional and amazing song 'I Miss You'.

They are united in their hope that they will find their missing loved ones and bring them home, and hope people might see the photos of the missing people in the background while they are on stage.

"Having the support of each other makes us stronger, sitting here together makes us stronger and singing together makes us super strong," Ms Godwin said.

In 2014 a Coroner's inquest concluded that 'on the balance of probabilities' Quentin either took his own life or it came to an end somehow.

Ms Godwin struggles to accept that, "with absolutely no proof it isn't enough reason for me to believe he is dead," she wrote on a website for Quentin.

She is now a family representative for the Missing People charity in London.